骨植入医用钛合金表面改性涂层研究进展

钛合金具有优良的力学性能以及良好的生物相容性,使其广泛应用于骨植入生物医药领域.随着植入物性能要求的不断提高,力学性能优异的高强模比新型医用钛合金逐渐被开发,同时,由于钛合金存在表面细胞粘附性差等骨整合问题,通过表面改性来提升钛合金生物相容性成为医用钛合金的研究焦点.概述了骨植入医用钛合金的发展历程和常用的表面改性涂层...     

医用316L不锈钢表面改性的研究进展

316L不锈钢作为生物医用材料在近20年内被广泛应用在矫形外科植入物、牙种植体和冠状动脉支架等领域。分析了目前医用316L不锈钢在临床应用中存在的主要问题,指出生物相容性、耐腐蚀性和耐磨损性有待提高和表面改性是改善上述问题的有效途径。综述了医用316L不锈钢表面改性的各种途径及研究成果,并展望了316L不锈钢表面改性的研究趋势。     

生物医用高分子材料的生物相容性及其表面改性技术

生物医用高分子材料是一类具有广泛用途的高科技产品,具有十分重要的应用价值和发展前景。生物相容性是生物医用高分子材料必须具备的优良特性,是材料产品成功应用的关键。目前,人们主要通过材料表面改性来提高生物医用高分子材料的生物相容性,以保证材料与机体相适应,生物医用高分子材料表面改性技术也因此成为人们竞相研究开发的热点。简述了生物医用高分子材料的生物相容性及其表面改性技术的相关问题。     

聚氨酯表面性能对其生物相容性的影响

特殊的微相分离结构,赋予聚氨酯弹性体良好的稳定性、优异的力学性能以及较好的生物相容性,已被广泛应用于生物医学领域.但其生物相容性仍不够理想.由于材料的生物相容性与材料表面的性质密切相关,对材料表面进行改性成为改善相容性的重要方法和途径,其研究受到广泛关注.对聚氨酯进行改性的诸多方法中,在材料表面进行化学接枝生物活性物质以提高生物相容性的方法是目前研究的热点.本文在对聚氨酯进行改性以提高其生物相容性的各种方法和途径进行评述的基础上,对聚氨酯表面结构性能与生物相容性的关系进行讨论,并重点对该研究领域的最新进展进行总结.     

含氟高分子生物材料的表面改性研究进展

含氟高分子材料因具有优异的稳定性和物理机械性能而成为目前研究和应用广泛的医用生物材料,但是,生物相容性的不足影响和限制了其作为体内长期植入材料的应用。因此,提高含氟高分子材料的生物相容性,尤其是通过表面改性的方法提高其生物相容性是一项有意义的研究课题。分别从改性手段和改性物质两方面综述了近年来国内外含氟高分子生物材料表面改性的研究发展。     

纯钛经电化学表面改性后的抗菌活性与生物相容性研究

在含不同电解质的电解液中利用电化学方法对纯钛进行表面改性,并将改性后的纯钛试样进行抗菌性和生物相容性实验.结果表明,纯钛在含氯化物的电解液中经表面改性后具有良好的抗茵活性和生物相容性,而在非氯化物的电解液中经表面改性后其抗茵活性和生物相容性则较差.     

生物电子学领域中的生物材料与生物相容性研究

生物电子学是一门涉及生物学、电子学、化学、物理、材料及信息技术等许多学科的交叉学科,生物电子学发展中的一些科学问题直接与生物材料及其生物相容性研究有关。从生物电子学的概念出发,从微电子植入器件、植入器件相关电极制造技术及表面改性、体外神经芯片表面修饰与改性3个方面,结合本实验室的相关研究工作,讨论了生物电子学领域中的生物材料与生物相容性研究进展,指出了生物材料和生物电子学的交叉是未来科学发展的必然趋势。     

通用高分子材料的化学和生物改性及其血液相容性研究

功能化与高性能化的通用高分子材料在医用耗材及器械领域有着广泛的应用。作为重要的医用材料之一,血液相容性是首先需要解决的关键科学问题。通用高分子的血液相容性可通过化学和生物修饰来实现。采用的方法大体分为本体改性和表面改性。本体改性主要通过反应接枝和反应共混实现;而表面改性则主要通过在材料表面制备亲水性聚合物刷或亲水层、固定生物活性分子和形成生物仿生膜3种方法来实现。目前,生物材料的血液相容性研究主要集中在血浆蛋白吸附、血小板粘附和红细胞溶血3个方面。结合本课题组近期在生物医用材料领域的研究成果,简要介绍了国内外近年来通用高分子材料的化学和生物改性及其血液相容性研究进展。     

NiTi形状记忆合金在生物医用领域的研究进展

NiTi形状记忆合金由于具有良好的力学相容性、耐蚀性和生物相容性而在生物医用材料领域得到广泛应用。本文总结了医用NiTi形状记忆合金的研究现状,评述了NiTi形状记忆合金的耐蚀性和生物相容性特点,并详细讨论了NiTi形状记忆合金的表面改性问题,对NiTi形状记忆合金的医用前景进行了展望。     

生物活性Ti合金材料的研究现状

Ti合金作为生物植入材料已应用于医学领域。综述了国内外Ti合金生物材料研究领域的最新进展，包括生物活性材料的微观特性、Ti合金表面改性和生物相容性。     

光固化生物陶瓷功能化研究进展EI北大核心CSCD

光固化制备陶瓷成为近年来快速发展的增材制造技术之一。生物陶瓷材料凭借良好的细胞相容性,在组织工程领域具有广阔前景,然而单一的生物陶瓷材料难以兼顾力学性能与生物相容性,其应用与推广受到极大限制。本文综述了适用于光固化的生物陶瓷材料改性及设计方法,重点讨论了材料改性、表面改性、结构设计以及微结构调控对于骨传导、骨诱导、抗菌、促进血管生成等生物性能及基础力学性能的综合影响,并指出通过改性及调控方法的组合探究多功能的实现及相互影响机理,能够充分实现光固化生物陶瓷的功能,推动其深层次应用。     

Surface Modification on Biodegradable Magnesium Alloys as Orthopedic Implant Materials to Improve the Bio-adaptability:A Review

Magnesium(Mg) and its alloys as a novel kind of biodegradable material have attracted much fundamental research and valuable exploration to develop its clinical application. Mg alloys degrade too fast at the early stage after implantation, thus commonly leading to some problems such as osteolysis, early fast mechanical loss, hydric bubble aggregation, gap formation between the implants and the tissue. Surface modification is one of the effective methods to control the degradation property of Mg alloys to adapt to the need of organism. Some coatings with bioactive elements have been developed, especially for the micro-arc oxidation coating, which has high adhesion strength and can be added with Ca, P, and Sr elements. Chemical deposition coating including bio-mimetic deposition coating, electro-deposition coating and chemical conversion coating can provide good anticorrosion property as well as better bioactivity with higher Ca and P content in the coating. From the biodegradation study, it can be seen that surface coating protected the Mg alloys at the early stage providing the Mg alloy substrate with lower degradation rate. The biocompatibility study showed that the surface modification could provide the cell and tissue stable and weak alkaline surface micro-environment adapting to the cell adhesion and tissue growth.The surface modification also decreased the mechanical loss at the early stage adapting to the loadbearing requirement at this stage. From the interface strength between Mg alloys implants and the surrounding tissue study, it can be seen that the surface modification improved the bio-adhesion of Mg alloys with the surrounding tissue, which is believed to be contributed to the tissue adaptability of the surface modification. Therefore, the surface modification adapts the biodegradable magnesium alloys to the need of biodegradation, biocompatibility and mechanical loss property. For the different clinical application, different surface modification methods can be provided to adapt to the clinical requirements for the Mg alloy implants.     

Blood compatibility of zinc–calcium phosphate conversion coating on Mg–1.33Li–0.6Ca alloy

Magnesium alloys as a new class of biomaterials possess biodegradability and biocompatibility in comparison with currently used metal implants. However, their rapid corrosion rates are necessary to be manipulated by appropriate coatings. In this paper, a new attempt was used to develop a zinc-calcium phosphate (Zn-Ca-P) conversion coating on Mg-1.33Li-0.6Ca alloys to increase the biocompatibility and improve the corrosion resistance. In vitro blood biocompatibility of the alloy with and without the Zn-Ca-P coating was investigated to determine its suitability as a degradable medical biomaterial. Blood biocompatibility was assessed from the hemolysis test, the dynamic cruor time test, blood cell count and SEM observation of the platelet adhesion to membrane surface. The results showed that the Zn-Ca-P coating on Mg-1.33Li-0.6Ca alloys had good blood compatibility, which is in accordance with the requirements for medical biomaterials.     

管腔内支架用金属材料的生物相容性及其表面改性

管腔内金属支架是用于植入人体各管道狭窄处起支撑作用的医疗器械,因其与人体组织直接接触,故对支架的生物相容性的研究十分重要。本文对用于管腔内支架的３１６Ｌ不锈钢和ＮｉＴｉ合金的耐腐蚀性和生物相容性进行了综合评述;并以冠状动脉支架为应用背景,着重分析了影响血管内支架血液相容性的因素,提出了对支架进行表面改性处理以提高其血液相容性的技术路线。     

医用NiTi合金表面改性的研究进展

近等原子比NiTi合金具有独特的力学性能,如形状记忆效应、超弹性和高阻尼效应,已成为一种新型的整形外科植入材料.但是,镍元素在生理条件下可能溶出,诱发毒性和炎性反应,限制了其在临床的广泛应用.分类介绍了几种可行的表面改性方法,均能有效地抑制镍离子的溶出,改善NiTi合金的抗腐蚀性和生物相容性,包括表面惰性涂层化、表面氧化、表面活性化和表面接枝大分子等.     

3D Printing in alloy design to improve biocompatibility in metallic implants

3D Printing (3DP) or additive manufacturing (AM) enables parts with complex shapes, design flexibility, and customization opportunities for defect specific patient-matched implants. 3DP or AM also offers a design platform that can be used to innovate novel alloys for application-specific compositional modifications. In medical applications, the biological response from a host tissue depends on a biomaterial's structural and compositional properties in the physiological environment. Application of 3DP can pave the way towards manufacturing innovative metallic implants, combining structural variations at different length scales and tailored compositions designed for specific biological responses. This study shows how 3DP can be used to design metallic alloys for orthopedic and dental applications with improved biocompatibility using in vitro and in vivo studies. Titanium (Ti) and its alloys are used extensively in biomedical devices due to excellent fatigue and corrosion resistance and good strength to weight ratio. However, Ti alloys' in vivo biological response is poor due to its bioinert surface. Different coatings and surface modification techniques are currently being used to improve the biocompatibility of Ti implants. We focused our efforts on improving Ti's biocompatibility via a combination of tantalum (Ta) chemistry in Ti, the addition of designed micro-porosity, and nanoscale surface modification to enhance both in vitro cytocompatibility and early stage in vivo osseointegration, which was studied in rat and rabbit distal femur models.     

Modification of biomaterials surface by mimetic cell membrane to improve biocompatibility

Modification of biomaterials surface by mimetic cell membrane for improving biocompatibility, to imitate the excellent biological and physiological proper- ties of the natural cell membrane, is an important research area in materials science. Numerous studies have been attempted to construct a mimetic cell membrane biointer- face composed of phosphorylcholine （PC）-containing polymers or other phospholipid analogues on biomaterials surface. PC-containing biointerfaces show outstanding characteristics, especially in biological aspects such as blood compatibility and antifouling property. In this mini-review, the strategies of membrane mimetic modification of biomaterials and their antifouling applications are summarized.     

A New Ti–15Zr–4Nb–4Ta alloy for medical applications

V ions exhibit cytotoxicity in a culture medium from concentrations of ≧0.2 mg/L. Ti, Zr, Nb and Ta are biocompatible elements. A new Ti–15Zr–4Nb–4Ta alloy for medical implants is being developed. Its microstructure, mechanical properties, corrosion resistance and corrosion fatigue properties in a physiological saline solution, biocompatibility with cultured cells, new bone tissue response through rat tibia implantation and surface modification are discussed. Medical applications will be also addressed.     

Tissue and cell reactions to implanted root-end filling materials

The use of root-end filling materials designed to stimulate hard and soft tissue repair in periradicular tissues is highly recommended. The materials should demonstrate good cell and tissue compatibility. The aim of the present study was to compare in vitro biocompatibility and in vivo tissue reaction with calcium hydroxide-based, eugenol-based and mineral trioxide aggregate root-end filling materials. The human osteosarcoma cell line was treated with immersed root end filling materials. The test materials were implanted in rats and the results observed at 6 and 8 weeks. In vitro, the highest survival rate was demonstrated for the mineral trioxide aggregate (p<0.05). In vivo, a radiopaque ring was evident in the calcium hydroxide implants on the eight-week radiograph. Histopathology revealed eugenol-based material with the inflammatory cells around the implant, with fibrous connective tissue forming around the calcium hydroxide-based analog. The mineral trioxide aggregate appears to be well tolerated by the tissue.